AIR POLLUTION
CONTROL DISTRICT

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Old Advisory Events

The information herein is NOT intended for use as a weather forecast. The Air District DOES NOT forecast but solely compiles information from both the Phoenix and San Diego National Weather Offices to relay information concerning potential changes in ambient air concentrations that may impact the public.

December 15 2016
Be Advised
High wind levels have the potential to suspend particulate matter into the air. High levels of PM10 may pose an impact to public health. It is recommended that active children and adults, and people with respiratory disease, such as asthma, limit their outdoor activities.

Potential increases in PM10 concentrations may increase to moderate or unhealthy level.

Imperial County Weather Synopsis
...HIGH WIND WARNING FOR THE MOUNTAIN RIDGE TOPS AND DESERTS...
...FLASH FLOOD WATCH FOR THE SAN BERNARDINO COUNTY MOUNTAINS...

QUICK UPDATE...
Just sent an update to add blowing dust & sand to the lower deserts for Friday afternoon when the greatest potential for high winds will be and the pops low. No other changes to the forecast for now

SYNOPSIS FROM THE SAN DIEGO OFFICE
A Pacific storm will move across Southern California overnight and Friday, bringing widespread rain along with strong winds in the mountains and deserts. Cool and dry weather will arrive behind the storm this weekend with brisk offshore winds. Fair and only slightly warmer next week with offshore flow

This will be a relatively warm storm with high snow levels, so resort locales are forecast to receive an inch or less. However, just the highest peaks of San Gorgonio and San Jacinto could see significant snowfall.

Winds are strengthening and we are still looking at strong winds for the mountain ridge tops to parts of the deserts. A High Wind Warning is in effect for these locales through Friday evening. WRF continues to show a mountain wave surfacing and impacting portions of the Coachella Valley, especially from Palm Springs to Palm Desert after sunrise through noon on Friday. These can be difficult to forecast, but it has been consistent so gusts to 60 mph are possible there with the most likely time after sunrise through noon on Friday. For the metropolitan areas...gusts look to average 20-30 mph.

SYNOPSIS FROM THE PHOENIX OFFICE
A change toward unsettled and cooler weather will develop Friday through early Saturday, with a chance of rain mainly across portions of southwest and south central Arizona. Gusty winds will also develop in southeast California and the Colorado River Valley Friday afternoon, ahead of a cold front. Clearing skies with slightly below normal temperatures will settle over the region Sunday through early next week.
Weather Story Phoenix Station Weather Story San Diego Station
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